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[thirdparty/binutils-gdb.git] / bfd / elf32-d10v.c
1 /* D10V-specific support for 32-bit ELF
2 Copyright (C) 1996-2018 Free Software Foundation, Inc.
3 Contributed by Martin Hunt (hunt@cygnus.com).
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/d10v.h"
27
28 /* Use REL instead of RELA to save space. */
29 #define USE_REL 1
30
31 static reloc_howto_type elf_d10v_howto_table[] =
32 {
33 /* This reloc does nothing. */
34 HOWTO (R_D10V_NONE, /* Type. */
35 0, /* Rightshift. */
36 3, /* Size (0 = byte, 1 = short, 2 = long). */
37 0, /* Bitsize. */
38 FALSE, /* PC_relative. */
39 0, /* Bitpos. */
40 complain_overflow_dont,/* Complain_on_overflow. */
41 bfd_elf_generic_reloc, /* Special_function. */
42 "R_D10V_NONE", /* Name. */
43 FALSE, /* Partial_inplace. */
44 0, /* Src_mask. */
45 0, /* Dst_mask. */
46 FALSE), /* PCrel_offset. */
47
48 /* An PC Relative 10-bit relocation, shifted by 2, right container. */
49 HOWTO (R_D10V_10_PCREL_R, /* Type. */
50 2, /* Rightshift. */
51 2, /* Size (0 = byte, 1 = short, 2 = long). */
52 8, /* Bitsize. */
53 TRUE, /* PC_relative. */
54 0, /* Bitpos. */
55 complain_overflow_signed, /* Complain_on_overflow. */
56 bfd_elf_generic_reloc, /* Special_function. */
57 "R_D10V_10_PCREL_R", /* Name. */
58 FALSE, /* Partial_inplace. */
59 0xff, /* Src_mask. */
60 0xff, /* Dst_mask. */
61 TRUE), /* PCrel_offset. */
62
63 /* An PC Relative 10-bit relocation, shifted by 2, left container. */
64 HOWTO (R_D10V_10_PCREL_L, /* Type. */
65 2, /* Rightshift. */
66 2, /* Size (0 = byte, 1 = short, 2 = long). */
67 8, /* Bitsize. */
68 TRUE, /* PC_relative. */
69 15, /* Bitpos. */
70 complain_overflow_signed, /* Complain_on_overflow. */
71 bfd_elf_generic_reloc, /* Special_function. */
72 "R_D10V_10_PCREL_L", /* Name. */
73 FALSE, /* Partial_inplace. */
74 0x07f8000, /* Src_mask. */
75 0x07f8000, /* Dst_mask. */
76 TRUE), /* PCrel_offset. */
77
78 /* A 16 bit absolute relocation. */
79 HOWTO (R_D10V_16, /* Type. */
80 0, /* Rightshift. */
81 1, /* Size (0 = byte, 1 = short, 2 = long). */
82 16, /* Bitsize. */
83 FALSE, /* PC_relative. */
84 0, /* Bitpos. */
85 complain_overflow_dont,/* Complain_on_overflow. */
86 bfd_elf_generic_reloc, /* Special_function. */
87 "R_D10V_16", /* Name. */
88 FALSE, /* Partial_inplace. */
89 0xffff, /* Src_mask. */
90 0xffff, /* Dst_mask. */
91 FALSE), /* PCrel_offset. */
92
93 /* An 18 bit absolute relocation, right shifted 2. */
94 HOWTO (R_D10V_18, /* Type. */
95 2, /* Rightshift. */
96 1, /* Size (0 = byte, 1 = short, 2 = long). */
97 16, /* Bitsize. */
98 FALSE, /* PC_relative. */
99 0, /* Bitpos. */
100 complain_overflow_dont, /* Complain_on_overflow. */
101 bfd_elf_generic_reloc, /* Special_function. */
102 "R_D10V_18", /* Name. */
103 FALSE, /* Partial_inplace. */
104 0xffff, /* Src_mask. */
105 0xffff, /* Dst_mask. */
106 FALSE), /* PCrel_offset. */
107
108 /* A relative 18 bit relocation, right shifted by 2. */
109 HOWTO (R_D10V_18_PCREL, /* Type. */
110 2, /* Rightshift. */
111 2, /* Size (0 = byte, 1 = short, 2 = long). */
112 16, /* Bitsize. */
113 TRUE, /* PC_relative. */
114 0, /* Bitpos. */
115 complain_overflow_signed, /* Complain_on_overflow. */
116 bfd_elf_generic_reloc, /* Special_function. */
117 "R_D10V_18_PCREL", /* Name. */
118 FALSE, /* Partial_inplace. */
119 0xffff, /* Src_mask. */
120 0xffff, /* Dst_mask. */
121 TRUE), /* PCrel_offset. */
122
123 /* A 32 bit absolute relocation. */
124 HOWTO (R_D10V_32, /* Type. */
125 0, /* Rightshift. */
126 2, /* Size (0 = byte, 1 = short, 2 = long). */
127 32, /* Bitsize. */
128 FALSE, /* PC_relative. */
129 0, /* Bitpos. */
130 complain_overflow_dont,/* Complain_on_overflow. */
131 bfd_elf_generic_reloc, /* Special_function. */
132 "R_D10V_32", /* Name. */
133 FALSE, /* Partial_inplace. */
134 0xffffffff, /* Src_mask. */
135 0xffffffff, /* Dst_mask. */
136 FALSE), /* PCrel_offset. */
137
138 /* GNU extension to record C++ vtable hierarchy. */
139 HOWTO (R_D10V_GNU_VTINHERIT, /* Type. */
140 0, /* Rightshift. */
141 2, /* Size (0 = byte, 1 = short, 2 = long). */
142 0, /* Bitsize. */
143 FALSE, /* PC_relative. */
144 0, /* Bitpos. */
145 complain_overflow_dont,/* Complain_on_overflow. */
146 NULL, /* Special_function. */
147 "R_D10V_GNU_VTINHERIT",/* Name. */
148 FALSE, /* Partial_inplace. */
149 0, /* Src_mask. */
150 0, /* Dst_mask. */
151 FALSE), /* PCrel_offset. */
152
153 /* GNU extension to record C++ vtable member usage. */
154 HOWTO (R_D10V_GNU_VTENTRY, /* Type. */
155 0, /* Rightshift. */
156 2, /* Size (0 = byte, 1 = short, 2 = long). */
157 0, /* Bitsize. */
158 FALSE, /* PC_relative. */
159 0, /* Bitpos. */
160 complain_overflow_dont,/* Complain_on_overflow. */
161 _bfd_elf_rel_vtable_reloc_fn, /* Special_function. */
162 "R_D10V_GNU_VTENTRY", /* Name. */
163 FALSE, /* Partial_inplace. */
164 0, /* Src_mask. */
165 0, /* Dst_mask. */
166 FALSE), /* PCrel_offset. */
167 };
168
169 /* Map BFD reloc types to D10V ELF reloc types. */
170
171 struct d10v_reloc_map
172 {
173 bfd_reloc_code_real_type bfd_reloc_val;
174 unsigned char elf_reloc_val;
175 };
176
177 static const struct d10v_reloc_map d10v_reloc_map[] =
178 {
179 { BFD_RELOC_NONE, R_D10V_NONE, },
180 { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
181 { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
182 { BFD_RELOC_16, R_D10V_16 },
183 { BFD_RELOC_D10V_18, R_D10V_18 },
184 { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
185 { BFD_RELOC_32, R_D10V_32 },
186 { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
187 { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
188 };
189
190 static reloc_howto_type *
191 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
192 bfd_reloc_code_real_type code)
193 {
194 unsigned int i;
195
196 for (i = 0;
197 i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
198 i++)
199 if (d10v_reloc_map[i].bfd_reloc_val == code)
200 return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
201
202 return NULL;
203 }
204
205 static reloc_howto_type *
206 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
207 const char *r_name)
208 {
209 unsigned int i;
210
211 for (i = 0;
212 i < sizeof (elf_d10v_howto_table) / sizeof (elf_d10v_howto_table[0]);
213 i++)
214 if (elf_d10v_howto_table[i].name != NULL
215 && strcasecmp (elf_d10v_howto_table[i].name, r_name) == 0)
216 return &elf_d10v_howto_table[i];
217
218 return NULL;
219 }
220
221 /* Set the howto pointer for an D10V ELF reloc. */
222
223 static void
224 d10v_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
225 arelent *cache_ptr,
226 Elf_Internal_Rela *dst)
227 {
228 unsigned int r_type;
229
230 r_type = ELF32_R_TYPE (dst->r_info);
231 if (r_type >= (unsigned int) R_D10V_max)
232 {
233 /* xgettext:c-format */
234 _bfd_error_handler (_("%pB: invalid D10V reloc number: %d"), abfd, r_type);
235 r_type = 0;
236 }
237 cache_ptr->howto = &elf_d10v_howto_table[r_type];
238 }
239
240 static asection *
241 elf32_d10v_gc_mark_hook (asection *sec,
242 struct bfd_link_info *info,
243 Elf_Internal_Rela *rel,
244 struct elf_link_hash_entry *h,
245 Elf_Internal_Sym *sym)
246 {
247 if (h != NULL)
248 switch (ELF32_R_TYPE (rel->r_info))
249 {
250 case R_D10V_GNU_VTINHERIT:
251 case R_D10V_GNU_VTENTRY:
252 return NULL;
253 }
254
255 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
256 }
257
258 /* Look through the relocs for a section during the first phase.
259 Since we don't do .gots or .plts, we just need to consider the
260 virtual table relocs for gc. */
261
262 static bfd_boolean
263 elf32_d10v_check_relocs (bfd *abfd,
264 struct bfd_link_info *info,
265 asection *sec,
266 const Elf_Internal_Rela *relocs)
267 {
268 Elf_Internal_Shdr *symtab_hdr;
269 struct elf_link_hash_entry **sym_hashes;
270 const Elf_Internal_Rela *rel;
271 const Elf_Internal_Rela *rel_end;
272
273 if (bfd_link_relocatable (info))
274 return TRUE;
275
276 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
277 sym_hashes = elf_sym_hashes (abfd);
278
279 rel_end = relocs + sec->reloc_count;
280 for (rel = relocs; rel < rel_end; rel++)
281 {
282 struct elf_link_hash_entry *h;
283 unsigned long r_symndx;
284
285 r_symndx = ELF32_R_SYM (rel->r_info);
286 if (r_symndx < symtab_hdr->sh_info)
287 h = NULL;
288 else
289 {
290 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
291 while (h->root.type == bfd_link_hash_indirect
292 || h->root.type == bfd_link_hash_warning)
293 h = (struct elf_link_hash_entry *) h->root.u.i.link;
294 }
295
296 switch (ELF32_R_TYPE (rel->r_info))
297 {
298 /* This relocation describes the C++ object vtable hierarchy.
299 Reconstruct it for later use during GC. */
300 case R_D10V_GNU_VTINHERIT:
301 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
302 return FALSE;
303 break;
304
305 /* This relocation describes which C++ vtable entries are actually
306 used. Record for later use during GC. */
307 case R_D10V_GNU_VTENTRY:
308 BFD_ASSERT (h != NULL);
309 if (h != NULL
310 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
311 return FALSE;
312 break;
313 }
314 }
315
316 return TRUE;
317 }
318
319 static bfd_vma
320 extract_rel_addend (bfd *abfd,
321 bfd_byte *where,
322 reloc_howto_type *howto)
323 {
324 bfd_vma insn, val;
325
326 switch (howto->size)
327 {
328 case 0:
329 insn = bfd_get_8 (abfd, where);
330 break;
331 case 1:
332 insn = bfd_get_16 (abfd, where);
333 break;
334 case 2:
335 insn = bfd_get_32 (abfd, where);
336 break;
337 default:
338 abort ();
339 }
340
341 val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift;
342 /* We should really be testing for signed addends here, but we don't
343 have that info directly in the howto. */
344 if (howto->pc_relative)
345 {
346 bfd_vma sign;
347 sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1));
348 sign = sign >> howto->bitpos << howto->rightshift;
349 val = (val ^ sign) - sign;
350 }
351 return val;
352 }
353
354 static void
355 insert_rel_addend (bfd *abfd,
356 bfd_byte *where,
357 reloc_howto_type *howto,
358 bfd_vma addend)
359 {
360 bfd_vma insn;
361
362 addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask;
363 insn = ~howto->dst_mask;
364 switch (howto->size)
365 {
366 case 0:
367 insn &= bfd_get_8 (abfd, where);
368 insn |= addend;
369 bfd_put_8 (abfd, insn, where);
370 break;
371 case 1:
372 insn &= bfd_get_16 (abfd, where);
373 insn |= addend;
374 bfd_put_16 (abfd, insn, where);
375 break;
376 case 2:
377 insn &= bfd_get_32 (abfd, where);
378 insn |= addend;
379 bfd_put_32 (abfd, insn, where);
380 break;
381 default:
382 abort ();
383 }
384 }
385
386 /* Relocate a D10V ELF section. */
387
388 static bfd_boolean
389 elf32_d10v_relocate_section (bfd *output_bfd,
390 struct bfd_link_info *info,
391 bfd *input_bfd,
392 asection *input_section,
393 bfd_byte *contents,
394 Elf_Internal_Rela *relocs,
395 Elf_Internal_Sym *local_syms,
396 asection **local_sections)
397 {
398 Elf_Internal_Shdr *symtab_hdr;
399 struct elf_link_hash_entry **sym_hashes;
400 Elf_Internal_Rela *rel, *relend;
401 const char *name;
402
403 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
404 sym_hashes = elf_sym_hashes (input_bfd);
405
406 rel = relocs;
407 relend = relocs + input_section->reloc_count;
408 for (; rel < relend; rel++)
409 {
410 int r_type;
411 reloc_howto_type *howto;
412 unsigned long r_symndx;
413 Elf_Internal_Sym *sym;
414 asection *sec;
415 struct elf_link_hash_entry *h;
416 bfd_vma relocation;
417 bfd_reloc_status_type r;
418
419 r_symndx = ELF32_R_SYM (rel->r_info);
420 r_type = ELF32_R_TYPE (rel->r_info);
421
422 if (r_type == R_D10V_GNU_VTENTRY
423 || r_type == R_D10V_GNU_VTINHERIT)
424 continue;
425
426 howto = elf_d10v_howto_table + r_type;
427 h = NULL;
428 sym = NULL;
429 sec = NULL;
430 if (r_symndx < symtab_hdr->sh_info)
431 {
432 sym = local_syms + r_symndx;
433 sec = local_sections[r_symndx];
434 relocation = (sec->output_section->vma
435 + sec->output_offset
436 + sym->st_value);
437 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
438 && ((sec->flags & SEC_MERGE) != 0
439 || (bfd_link_relocatable (info)
440 && sec->output_offset != 0)))
441 {
442 bfd_vma addend;
443 bfd_byte *where = contents + rel->r_offset;
444
445 addend = extract_rel_addend (input_bfd, where, howto);
446
447 if (bfd_link_relocatable (info))
448 addend += sec->output_offset;
449 else
450 {
451 asection *msec = sec;
452 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
453 addend);
454 addend -= relocation;
455 addend += msec->output_section->vma + msec->output_offset;
456 }
457 insert_rel_addend (input_bfd, where, howto, addend);
458 }
459 }
460 else
461 {
462 bfd_boolean unresolved_reloc, warned, ignored;
463
464 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
465 r_symndx, symtab_hdr, sym_hashes,
466 h, sec, relocation,
467 unresolved_reloc, warned, ignored);
468 }
469
470 if (sec != NULL && discarded_section (sec))
471 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
472 rel, 1, relend, howto, 0, contents);
473
474 if (bfd_link_relocatable (info))
475 continue;
476
477 if (h != NULL)
478 name = h->root.root.string;
479 else
480 {
481 name = (bfd_elf_string_from_elf_section
482 (input_bfd, symtab_hdr->sh_link, sym->st_name));
483 if (name == NULL || *name == '\0')
484 name = bfd_section_name (input_bfd, sec);
485 }
486
487 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
488 contents, rel->r_offset,
489 relocation, (bfd_vma) 0);
490
491 if (r != bfd_reloc_ok)
492 {
493 const char * msg = (const char *) 0;
494
495 switch (r)
496 {
497 case bfd_reloc_overflow:
498 (*info->callbacks->reloc_overflow)
499 (info, (h ? &h->root : NULL), name, howto->name,
500 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
501 break;
502
503 case bfd_reloc_undefined:
504 (*info->callbacks->undefined_symbol)
505 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
506 break;
507
508 case bfd_reloc_outofrange:
509 msg = _("internal error: out of range error");
510 goto common_error;
511
512 case bfd_reloc_notsupported:
513 msg = _("internal error: unsupported relocation error");
514 goto common_error;
515
516 case bfd_reloc_dangerous:
517 msg = _("internal error: dangerous error");
518 goto common_error;
519
520 default:
521 msg = _("internal error: unknown error");
522 /* fall through */
523
524 common_error:
525 (*info->callbacks->warning) (info, msg, name, input_bfd,
526 input_section, rel->r_offset);
527 break;
528 }
529 }
530 }
531
532 return TRUE;
533 }
534 #define ELF_ARCH bfd_arch_d10v
535 #define ELF_MACHINE_CODE EM_D10V
536 #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V
537 #define ELF_MAXPAGESIZE 0x1000
538
539 #define TARGET_BIG_SYM d10v_elf32_vec
540 #define TARGET_BIG_NAME "elf32-d10v"
541
542 #define elf_info_to_howto 0
543 #define elf_info_to_howto_rel d10v_info_to_howto_rel
544 #define elf_backend_object_p 0
545 #define elf_backend_final_write_processing 0
546 #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
547 #define elf_backend_check_relocs elf32_d10v_check_relocs
548 #define elf_backend_relocate_section elf32_d10v_relocate_section
549 #define elf_backend_can_gc_sections 1
550
551 #include "elf32-target.h"
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